EP2175136A1 - Wellendichtung - Google Patents

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Publication number
EP2175136A1
EP2175136A1 EP08791029A EP08791029A EP2175136A1 EP 2175136 A1 EP2175136 A1 EP 2175136A1 EP 08791029 A EP08791029 A EP 08791029A EP 08791029 A EP08791029 A EP 08791029A EP 2175136 A1 EP2175136 A1 EP 2175136A1
Authority
EP
European Patent Office
Prior art keywords
shaft seal
shaft
compressor
supporting plate
fluid device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08791029A
Other languages
English (en)
French (fr)
Other versions
EP2175136A4 (de
Inventor
Jiro Iizuka
Takashi Fukumuro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanden Corp
Original Assignee
Sanden Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanden Corp filed Critical Sanden Corp
Publication of EP2175136A1 publication Critical patent/EP2175136A1/de
Publication of EP2175136A4 publication Critical patent/EP2175136A4/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1054—Actuating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/109—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3228—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip formed by deforming a flat ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/324—Arrangements for lubrication or cooling of the sealing itself
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials

Definitions

  • the present invention relates to a shaft seal which seals an inside of a housing against its outside as for a compressor shaft, for example, and specifically relates to a shaft seal which is suitable to be used for a compressor using a refrigerant such as carbon dioxide.
  • a shaft seal which slidably contacts an outer surface of a shaft seal and which seals an inside of a device such as compressor housing against an outside of the device such as an atmosphere side is well known formerly.
  • a sliding contact section of the shaft seal like the above is made of an elastomer such as nitrile rubber, hydrogenated nitrile rubber, fluoro-rubber, EPDM which is a kind of ethylene-propylene rubber, or is made of a synthetic resin such as polyether-ketone resin, polyamide resin, fluoro-resin, tetrafluoroethylene resin, polyphenylene sulfide resin, polyamide resin, polyimide resin, polyvinyl fluoride resin, polyvinylidene fluoride resin, polyvinyl chloride resin, polyvinylidene chloride resin, liquid crystal polymer, polychloro-trifluoro-ethylene resin and polyvinyl alcohol resin.
  • tetrafluoroethylene resin which may be called PTFE hereinafter, is used as main constituent of unlubricated sealing materials, is a thermoplastic resin which is excellent in the thermal resistance and the chemical resistance and is used generally because its character is less variable depending on temperature and is durable from extremely low temperature up to high temperature of 260 °C.
  • the temperature of the sliding contact section may be over 200 °C under a high-speed condition and it may be 250 - 300 °C when lacking the lube.
  • the compressor is a variable displacement type compressor with a swash plate the inner pressure of the crank chamber becomes high pressure around 3 - 4.5 MPa and the surface pressure of the sliding contact surface rises. Therefore, in the compressors using a carbon dioxide refrigerant, the thermal resistance and the abrasion resistance might not be sufficient when the sliding contact section of the shaft seal is made of the above described conventional general resin or rubber materials.
  • an object of the present invention is to provide a shaft seal which can improve the thermal resistance and abrasion resistance of the shaft seal in an open-type compressor or a fluid device and can exhibit an excellent durability, and specifically, to provide a shaft seal suitable for compressors using carbon dioxide refrigerant which is driven under a high temperature or a high pressure condition.
  • a shaft seal according to the present invention is a shaft seal which is in sliding contact with an outer surface of a shaft of an open type compressor or a fluid device driven by an external power source and seals an inside of the compressor or of the fluid device against an outside thereof, characterized in that at least a sliding section of the shaft seal which sliding section is in sliding contact with the outer surface of the shaft is made from a material into which a substance having a melting point in a range of 150 - 300 °C is added and uniformly dispersed.
  • any of silicon carbide, graphite, hydrogenated nitrile rubber, nitrile rubber, fluoro-rubber, ethylene-propylene rubber and polyamide can be used as the main constituent material, and a material including tin or bismuth, or tin and bismuth can be used as the additive.
  • the above-described sliding contact section prefferably be constructed from a lip-shaped flexible member, in particular.
  • the lip-shaped flexible member as the sliding contact section contacts to be supported by a supporting plate whose thermal conductivity is higher than that of the lip-shaped flexible member, at a position communicating with an outside (for example, an atmosphere side) of a device such as the open-type compressor or the fluid device.
  • a supporting plate is made of materials, such as an aluminum alloy or a copper alloy, whose thermal conductivities are high.
  • the coherence surface width in an axial direction between the supporting plate and the outer circumferential case of the shaft seal is preferably set equal to, or more than, a plate thickness of the supporting plate.
  • this shaft seal outer circumferential case is constructed as can be inserted into and fixed to a housing of the device.
  • the shaft seal according to the present invention is applicable as a shaft seal in various fields, and specifically suitable as a shaft seal of an open-type compressor or a fluid device, and is especially suitable for a shaft seal of a compressor using carbon dioxide refrigerant such as a variable displacement swash plate-type compressor of which temperature in the sliding contact section exceeds 200 °C constantly.
  • the sliding contact section is made of a material where a substance having a melting point within the range of 150 - 300 °C is added and uniformly dispersed, an abnormal overheat of the sliding contact section can be prevented by utilizing the melting heat of the additive, in case that the temperature of the sliding contact section becomes a high temperature over 150 °C.
  • the heat resistance of the sliding contact section and its abrasion resistance can be improved, so that a shaft seal which can perform an excellent durability can be fulfilled.
  • Fig. 1 shows a variable displacement swash plate-type compressor to which a shaft seal according to an embodiment of the present invention is applied.
  • symbol 1 shows a variable displacement swash plate-type compressor and compressor 1 in this embodiment is constituted as a compressor using carbon dioxide refrigerant.
  • Compressor 1 has cylinder block 3 in which plural cylinder bores 2 are provided as penetrating in the circumferential direction.
  • Front housing 4 is provided at one end of cylinder block 3, and cylinder head 5 is provided through valve plate 6 at the other end.
  • Drive shaft 8 is provided as extending in crank chamber 7 sectioned by cylinder block 3 and front housing 4.
  • Swash plate 9 shaped like a round plate is provided as being integrally rotatable.
  • Swash plate 9 is pieced as variably tilting on rotor 10 which is firmly fixed to drive shaft 8 through connection section 11 and pivot pin 12.
  • Shaft seal 16 is provided between drive shaft 8 and boss section 13, so that the inside of crank chamber 7 , which means the inside of the device, is sealed against the outside of the device (atmosphere side), by shaft seal 16.
  • Piston 18 is reciprocably inserted in cylinder bore 2.
  • a pair of shoes 19 is held at one end of piston 18 and the pair of shoes slidably contacts to both sides of swash plate 9. By this sliding contact, the rotary movement of swash plate 9 is converted into the reciprocation movement of piston 18.
  • cylinder head 5 The inside of cylinder head 5 is sectioned into suction chamber 20 and discharge chamber 21. Cylinder bore 2 and suction chamber 20 are communicated through suction opening 22, and suction opening 22 is opened and closed by suction valve 23. In addition, cylinder bore 2 and discharge chamber 21 are communicated through discharge opening 24, and discharge opening 24 is opened and closed by discharge valve 25. The open-ratio of discharge valve 25 into discharge chamber 21 is regulated by retainer 26.
  • shaft seal 16 has internal pressure side lip seal 28 which slidably contact with the outer surface of drive shaft 8, and also has atmosphere side lip seal 29 (outer side lip seal).
  • Lip seals 28,29 as sliding contact sections, both are made of lip-shaped flexible members.
  • Lip seal 28 has fixed part 28b and movable part 28a which is slidably contacted with the outer surface of drive shaft 8.
  • lip seal 29 has fixed part 29b which is slidably contacted with the outer surface of drive shaft 8, and also has movable part 29a.
  • Lip seals 28,29 are composed of materials which are made by adding and dispersing uniformly an additive (tin or bismuth, or tin and bismuth) having a melting point in a range of 150-300 °C to any of silicon carbide, graphite, hydrogenated nitrile rubber, nitrile rubber, fluoro-rubber, ethylene propylene rubber and polyamide as a main constituent.
  • an additive tin or bismuth, or tin and bismuth
  • the whole lip seals 28,29 are composed of the above-described composite materials, however, it would be sufficient to perform the function and effect of the present invention if at least movable part 28a,29a are composed of the above-described composite materials.
  • Lip seal 28 is supported in contact with supporting plate 30 at the outer side (the left side in Fig. 2 ).
  • movable part 29a of lip seal 29 is constructed as slidably contacting the outer surface of drive shaft 8, and lip seal 29 is supported in contact with supporting plate 31 at the outer side.
  • Supporting plates 30,31 in this embodiment are made of materials, such as aluminum alloy and copper alloy, whose thermal conductivities are higher than that of materials composing lip seal 28,29.
  • outer circumferential case 32 of shaft seal The outer circumferences of supporting plates 30,31 are covered by outer circumferential case 32 of shaft seal.
  • Outer circumferential case 32 of shaft seal is inserted into boss section 13 and fixed therein.
  • Snap ring 33 is provided at the outer side of outer circumferential case of shaft seal 32.
  • one end 32a of outer circumferential case 32 of shaft seal is exposed toward the outside of compressor 1.
  • Outer circumferential case 32 of shaft case is made of metal such as iron.
  • the coherent surface width in the axial direction between outer circumferential case 32 of shaft seal and supporting plate 30(31) is set equal to, or more than, the plate thickness of supporting plate 30(31).
  • the temperature of movable parts 28a,29a of lip seal 28,29 may be over 200 °C under a high-speed condition, and they may be 250 - 300 °C when lacking the lube.
  • compressor 1 is a variable displacement swash plate-type compressor, the pressure inside crank chamber 7 becomes high pressure around 3 - 4.5 MPa and the surface pressures of sliding contact sections 28a,29a rise. Accordingly, superior thermal resistance and rub resistance are required for lip seals 28,29, and specifically for sliding contact section 28a,29a.
  • lip seals 28,29 are supported at the outside of the device by contacting supporting plates 30,31 whose thermal conductivities are higher than those of lip seals 28,29, the heat radiation from lip seals 28,29 to the outside can be much more promoted. Therefore, the fear that lip seals 28,29 might be overheated can be surely dissolved.
  • the coherent surface width in an axial direction between supporting plate 30(31) and outer circumferential case 32 of shaft seal is set equal to, or more than, a plate thickness of supporting plate 30(31) in the present invention, the heat can be conducted from lip seal 28(29) via supporting plate 30(31) to outer circumferential case 32 of shaft seal efficiently. Furthermore, because one end 32a of outer circumferential case 32 of shaft seal is exposed to the outside of compressor 1, the heat can be radiated from one end 32a to the atmosphere side efficiently.
  • the shaft seal according to the present invention is applicable to a shaft seal in various fields, specifically suitable as a shaft seal of open-type compressors or fluid devices, and chiefly suitable for compressors such as variable displacement swash plate-type compressors which use a carbon dioxide refrigerant and of which sliding contact section temperatures are more than 200 °C constantly.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compressor (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Sealing Of Bearings (AREA)
EP08791029A 2007-07-18 2008-07-10 Wellendichtung Withdrawn EP2175136A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007186817A JP2009024541A (ja) 2007-07-18 2007-07-18 軸シール
PCT/JP2008/062459 WO2009011274A1 (ja) 2007-07-18 2008-07-10 軸シール

Publications (2)

Publication Number Publication Date
EP2175136A1 true EP2175136A1 (de) 2010-04-14
EP2175136A4 EP2175136A4 (de) 2010-10-06

Family

ID=40259610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08791029A Withdrawn EP2175136A4 (de) 2007-07-18 2008-07-10 Wellendichtung

Country Status (5)

Country Link
US (1) US20100201079A1 (de)
EP (1) EP2175136A4 (de)
JP (1) JP2009024541A (de)
CN (1) CN101688526A (de)
WO (1) WO2009011274A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140146581A (ko) * 2012-01-19 2014-12-26 플로우서브 매니지먼트 컴퍼니 고온, 고압 적용을 위한 정지 실
EP2933536A4 (de) * 2012-12-14 2015-12-30 Nok Corp Dichtungsvorrichtung
CN105697261A (zh) * 2016-04-13 2016-06-22 镇江江大泵业科技有限公司 一种用于排污泵的密封结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101521593B1 (ko) * 2014-11-06 2015-06-16 코리아씰라인(주) 분체이송용 씰링장치
US20210317915A1 (en) 2018-09-14 2021-10-14 Eagle Industry Co., Ltd. Lip type shaft sealing device

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EP1304515A2 (de) * 2001-10-19 2003-04-23 Eagle Industry Co., Ltd. Dichtungsvorrichtung
US20040058828A1 (en) * 2002-09-24 2004-03-25 Daido Metal Company Ltd. Sliding composition and sliding member

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GB832054A (en) * 1958-08-26 1960-04-06 Paul Kind Process of producing stuffing box packings and packings manufactured by the process
DE2526182B1 (de) * 1975-06-12 1976-09-02 Sigri Elektrographit Gmbh Verfahren zum herstellen eines dichtungsrings
EP0945653A1 (de) * 1998-03-23 1999-09-29 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Wellendichtung und Verdichter
EP1304515A2 (de) * 2001-10-19 2003-04-23 Eagle Industry Co., Ltd. Dichtungsvorrichtung
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140146581A (ko) * 2012-01-19 2014-12-26 플로우서브 매니지먼트 컴퍼니 고온, 고압 적용을 위한 정지 실
EP2933536A4 (de) * 2012-12-14 2015-12-30 Nok Corp Dichtungsvorrichtung
US9695938B2 (en) 2012-12-14 2017-07-04 Nok Corporation Sealing device
CN105697261A (zh) * 2016-04-13 2016-06-22 镇江江大泵业科技有限公司 一种用于排污泵的密封结构

Also Published As

Publication number Publication date
US20100201079A1 (en) 2010-08-12
WO2009011274A1 (ja) 2009-01-22
CN101688526A (zh) 2010-03-31
JP2009024541A (ja) 2009-02-05
EP2175136A4 (de) 2010-10-06

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